What does a positive Kernig's sign entail?

A positive Kernig's sign is indicative of meningitis or irritation of the meninges. It specifically entails pain experienced when the leg is flexed at the knee and hip while the patient is lying supine, followed by an inability to fully extend the leg. This maneuver creates tension on the inflamed meninges, which leads to discomfort or pain in the back and neck, offering a clinical insight into potential meningeal irritation.

The other options do not accurately reflect what a positive Kernig's sign involves. For example, increased reflex activity is more generalized and may occur in various neurological conditions, but it does not specifically pertain to the characteristics associated with Kernig's sign. Similarly, pain during ankle dorsiflexion may suggest other issues such as muscle or tendon strain but is not relevant to Kernig's sign. Lastly, weakness in leg movements reflects a different aspect of neurological examination, focusing on motor function rather than the specific pain response associated with Kernig's position and movement of the legs.